Milestone birthdays, such as turning 18, 21, 30, or 50, are often celebrated with greater significance than regular birthdays. These occasions typically mark important transitions in life, such as reaching adulthood or entering a new decade. Celebrations for milestone birthdays may involve larger gatherings, elaborate parties, or unique experiences, such as travel or special events. For example, a 21st birthday in many cultures is celebrated with a party that may include alcohol, symbolizing the legal transition into adulthood. Similarly, a 50th birthday might be commemorated with a grand celebration reflecting on the person's life achievements. The emphasis on these milestones often leads to more thoughtful planning and a desire to create lasting memories.