Researchers from University of Sheffield, University of Manchester and Manchester Metropolitan in the UK analysed data from over 7,000 people to examine difficulties with sexual activities and function, attitudes towards sex and details about the current sexual partners of over 50s.
"There is a growing body of evidence showing that sexual activity is important to the quality of life of older adults, and that it can be influenced by physical, psychological and social factors," said Sharron Hinchliff from University of Sheffield.
"Whether or not a sexual difficulty within the relationship has a negative impact within that relationship also differs between couples," Hinchliff said.
"For instance, some participants in the study mentioned becoming more intimate as a way to deal with sexual changes," she said.
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They found that women over 80 were more likely to share the sexual likes of their partner, feel emotionally close to them and not feel obligated to have sex with them than those aged 50-79.
However, men over 80 also reported that they felt a greater degree of obligation to have sex with their partner than at any age between 50-79.
The study also found that for both men and women aged over 50, there was a positive association between frequency of physical intimacy and overall levels of subjective wellbeing.
However, whilst women's subjective wellbeing continued to increase with frequency of intimate behaviour, subjective wellbeing was slightly lower amongst men who reported having sexual intercourse with their partners every day than it was for those who reported intercourse two or three times per week.
"We know that positive sexuality and intimacy throughout the lifecourse is linked to higher levels of happiness and wellbeing - irrespective of age," said David Lee, Research Fellow at The University of Manchester.
"Older people have a right to good sexual health care and should be able to easily access joined up services to help them meet that goal," said Lee.
The research was published in the Journal of Sexual Research.