(UNEDITED) According to the laws of human biology, human male's sex-drive normally diminishes by the time they reach 65! However, due to viagra, etc, many male humans have prolonged the enjoyment, sadly their missus's do not share the same urge!
One Dutch OAP, who reached the ripe old of 69 with a pair of dodgy knees and, geriatric hips, after a life of laying bricks on building sites all over Holland, took a trip to his local doc asking him to prescript a dose of viagra before he turns 70.
The doc asked his ageing patient why the hell he needs viagra because he preferred to offer him knee and hip replacements instead. The OAP explained his final wish before turning 70, and suddenly the Euro dropped.
"But what about your wife then?" The OAP answered, "What's she got to do with it?" The Euro dropped once more!
Without ado, the doc gave him his prescription. He trotted, OAP style, to the chemist, and then to the local Bordello where a tasty young, full-bosom-ed Romanian 'sex worker' asked the old boy what he would like.
"A quick 'soixante-neuf', but quick, my knees are killing me," his reply.
"75 Euros, special rate for horny OAP's!" Was her answer.
"No problem, just raided the missus's tea box where she saves her money for her weekly blue-rinse!"
So, the happy pair went upstairs, and 30 minutes later, he left the establishment, walking rather wobbly, it's obvious with dodgy knees, and returned home for a cuppa!
His wife asked him what he wanted for his 70th?
"Nothing darling, just had my final birthday wish, and the doc has promised me a new pair of knees and hips, what more does a near 70 year-old desire!"
Thanks to modern science, male OAP's can generally prolong their sex-lives, but working on their knees on building sites could have massive side-effects!