The idea of older people having sex isn't a bad thing. We're all going to be older people some day, with luck, and having an active sex life as you get older is a good and healthy thing. There's nothing icky about older people having sex.
Although there is a line that probably should be drawn when the sex is this:
This time [Margaret Holyland] and her husband Rob were invited to take part in tantric sex lessons with aging pop star Leapy Lea and his pneumatic Danish girlfriend Bettina, self-styled psychic healer Raimondo and geriatric swinging professor Colin.You might be struggling to place Leapy Lee. This is Leapy Lee:
Older people having sex is an excellent thing. When that sex starts to involve Leapy Lee, though, please make sure your curtains are drawn.