Dear Mary: How do I get my 74-year-old brother to realise he’s old and must act his age?

"The problem is he will not accept that he is an old man. He insists he can do DIY even though he has injured himself a number of times."

Mary O'Conor

I am seeking advice about my younger brother. I say younger — he is 74 years old and I am 78 next birthday.