Question: If children can't swim by what age do they receive intensive daily lessons?
About the article "Human swimming", section "Lessons".

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Children generally do not swim independently until 4 years of age.
In Sweden, Denmark, Norway, Estonia and Finland, the curriculum for the fifth grade (fourth grade in Estonia) states that all children should learn how to swim as well as how to handle emergencies near water.
Most commonly, children are expected to be able to swim – of which at least on their back – after first falling into deep water and getting their head under water.
Even though about 95 percent of Swedish school children know how to swim, drowning remains the third most common cause of death among children.
In both the Netherlands and Belgium swimming lessons under school time ("schoolzwemmen", school swimming) are supported by the government.
Most schools provide swimming lessons.
There is a long tradition of swimming lessons in the Netherlands and Belgium, the Dutch translation for the breaststroke swimming style is even "schoolslag" (schoolstroke).
The children learn a variant of the breaststroke, which is technically not entirely correct.
In France, swimming is a compulsory part of the curriculum for primary schools.
Children usually spend one semester per year learning swimming during CE1/CE2/CM1 (2nd, 3rd and 4th grade).
In many places, swimming lessons are provided by local swimming pools, both those run by the local authority and by private leisure companies.
Many schools also include swimming lessons into their Physical Education curricula, provided either in the schools' own pool, or in the nearest public pool.
In the UK, the "Top-ups scheme" calls for school children who cannot swim by the age of 11 to receive intensive daily lessons.
These children who have not reached Great Britain's National Curriculum standard of swimming 25 metres by the time they leave primary school will be given a half-hour lesson every day for two weeks during term-time.
In Canada and Mexico there has been a call for swimming to be included in the public school curriculum.
In USA there is the Infant Swimming Resource (ISR) initiative that provides lessons for infant children, to cope with emergency situation when they have fallen into water.
They are learned how to roll-back-to-float (hold their breath underwater, to roll onto their back, to float unassisted, rest and breathe until help arrives).
Inflatable armbands are inexpensive, easy to find, and durable.
They can help children to build confidence and learn to swim earlier.
The amount of flotation provided can be decreased by deflating them partially.
During swimming lessons, children may do better in difficult lessons and be easier to supervise if they wear armbands. 
In many places, swimming lessons are provided by local swimming pools, both those run by the local authority and by private leisure companies.
Many schools also include swimming lessons into their Physical Education curricula, provided either in the schools' own pools, or in the nearest public pool.
The Department for Education in England includes learning to swim as a compulsory element in Primary School PE Curriculum.
At the end of year 6 (age 11), all children must be able to swim 25 metres (front and back) and demonstrate an understanding of water safety.
Schools can decide when and where pupils will learn to swim.
Many children in the UK learn to swim in lessons that are not provided by their Primary School and can swim 25 metres by the age of 6.
In Sweden, Denmark, Norway and Finland, the curriculum for 11-year-olds in the fifth grade states that all children should learn how to swim as well as how to handle emergencies near water.
Most commonly, children are expected to be able to swim 200 metres (220 yards) – of which at least is on their back – after first falling into deep water and getting their head under water.
Even though about 95 percent of Swedish school children know how to swim, drowning remains the third most common cause of death among children.
In both the Netherlands and Belgium, swimming lessons during school time ("schoolzwemmen", school swimming) are supported by the government.
Most schools provide swimming lessons.
There is a long tradition of swimming lessons in the Netherlands and in Belgium; the Dutch translation for the breaststroke swimming style is "schoolslag" (schoolstroke).
The children learn a variant of the breaststroke, which is technically not entirely correct.
In Germany and Austria, school swimming ("Schulschwimmen") is part of the elementary school curriculum leading to the entry level certificate "Frühschwimmer" for about 90 percent of the children (a 95% goal set by the ministers for education with actual percentages ranging as low as 75% in some schools).
About 50 percent reach a higher swimming level certificate during school swimming.
In Switzerland most schools offer a swimming course, however only 70% of the students take part in it which has led to the "Schulschwimmen für alle“ petition in 2007.
Unlike in Germany and Austria, a swimming test including a jump from the diving tower is common in Swiss schools.
In France, school swimming ("natation scolaire") is part of the curriculum for physical education in the 2nd and 3rd grade in elementary school, or for children aged between 4 and 6 years of age.
The aim is successful completion of entry into water then swimming for 50 metres, before floating for 10 seconds, then swimming on the front and on the back (for 10 metres each), ending with retrieval of an object from deep water of more than 2 metres.
In the UK, the "Top-ups scheme" calls for school children who cannot swim by the age of 11 to receive intensive daily lessons.
These children who have not reached Great Britain's National Curriculum standard of swimming 25 metres by the time they leave primary school will be given a half-hour lesson every day for two weeks during term-time.
In Canada and Mexico there has been a call for swimming to be included in the public school curriculum.
In Singapore, most swimming schools teach the SwimSafer Programme introduced by Singapore National Water Safety Council in July, 2010 with support from the Singapore Sports Council.
The SwimSafer Programme combines instruction in swimming and life-saving skills.
Example Swimsafer level 1 and 2 video http://swim2survive.blogspot.sg/ 
Swimming lessons is the process of learning to swim.
In most countries there is a definition of a number of swimming levels that is reached in the process of the curriculum.
The respective certificates of swimming tests are required for further training in aquatic abilities.
Many countries have defined a minimum swimming level that children should reach by the end of primary education, in most cases with the help of school swimming classes being part of the normal curriculum.
Children are often given swimming lessons, which serve to develop swimming technique and confidence.
Children generally do not swim independently until 4 years of age. 
ScotlandIn Scotland swimming lessons are undertaken by pupils at an age 8 or 9 when the child is in Primary 5.
These lessons take place during the school day.
The Scottish Amateur Swimming Association - known as Scottish Swimming - has called for all young children to be entitled to free swimming lessons as they have been in England and Wales since the 1990s.
Swimming lessons in Scotland have come under criticism because of the long waiting lists where in some counties there is a waiting list of up to 2000 children, or 1040 days.
This has led to an increase of private swimming schools start up which are able to use private pools (as opposed to council run lessons only using council pools).
Lessons in Scotland generally follow two main award schemes, the STA (Swimming Teachers Association) or ASA (Amateur Swimming Association) award schemes.
The council lessons tend to follow the ASA Award Scheme whilst private swimming lessons use either of them.
There have been a number of high profile cases of private swimming lessons changing from ASA to STA, such as Discover Swimming Ltd. who have stated a necessity for such changes because of limitations to the ASA Award Scheme such as the ASA being too restrictive in what is able to be taught and also the ASA attempts to get all their swimmers to go towards club swimming.
The STA also teaches about life-saving techniques in their lessons which the ASA largely ignore.
In England, by Key Stage 1 (Age 5-7) all pupils are expected to be able to swim 10 to 10 metres unaided.
There is no provision for this in the Curriculum for Excellence in Scotland.