Introduction A clear comprehension of old ages in relation to sex functioning is a very essential aspect. There is only one direction in human growth that is from the youth to the old. Physical health and sexual functioning are related and therefore taking time to dig deep about sexual functioning for the later years to come is very helpful in terms of medication and biology. Undesirable sexual functioning can be the starting point of very disturbing health conditions. An astonishing revelation about erectile dysfunction found in most men is the major cause of asymptomatic coronary artery sickness and obviously damaged endothelial utility. Out of all people infected with the HIV/AIDS in the United States of America, adults of at least 50 years comprise of nineteen percent (Delamater and Karraker, 2009 p.2). Another important thing to note is that there exists a relationship between happiness and sexual welfare/comfort as years progress. This explains that an enhanced and stable state of mind along the age progression line is an important component towards attaining a prolonged sexual function (Delamater and Karraker, 2009 p.2). Definition of sexual functioning and dysfunction Sexual functioning is the ability to perform any sexual related activity within the scope of sex. This may incorporate the ability to bring about the urge for sex, arousal, reaching satisfying orgasm, as well as a reasonable sustained duration of sexual activity (Delamater and Karraker, 2009 p.3). However, this definition may vary based on factors such as the absence or presence of a sexual partner and the regularity of intercourse as years progress. Sexual dysfunction may refer to the inability to perform one, some, or any of sexual or related activities. It is impairment to genital activity that leads to orgasm. There is always a postulation that sexual quality reduces with age but this may actually change if men/women but not all, attain greater control which is voluntary especially the control over ejaculation (for men), despite the frequency of the activity (Mc Anulty & Burnette, 2006 p.169). Determinants of sexual functioning and change The factors expounded below affect the sexual functioning offered in the following areas of psychological, social, biologic and relations/interactions. Psychological factors These factors are very essential for sexual functioning.They can affect the expression of other determinants of sex functioning. For instance, emotional and interpersonal motivation dictates the impact of sexual drive in the case of sexual attractiveness. Motivation can help in attaining the desired attitude about sexuality, which is another part of sexual desire. It can also compensate for reduced physiologic desire for sexual activity especially resulting from declining testosterone stage. Due to old age, Psychological situation like depression contributes a lot in sexual function especially in adults due to accruing responsibilities. It plays an integral part in that even the medications used to treat it are associated with sexual dysfunction such as erectile dysfunction, low libido, and analgesia, which can go on long after discontinued medication (Delamater and Karraker, 2009 p.3). A case where woman responds to sexual activity not from her own initiative but from her partner will have low sexual desire. Whether the initiative is voluntary or not this psychological factor is independent from sexual functioning. Social factors The presence or accessibility of a partner is an import