Another one who lost someone around 60 and felt cheated (aged 58). I felt cheated because I was cheated, they had everything to live for and but for fucking cancer could have had another 15-20+ years. They were far from average life expectancy. I really hope 60 is not old because we're screwed if it is given that many of us won't see retirement until 70 plus.
I am early 30s (so not quite middle aged yet by your standards) and still feel I am young, a lot of my friends are 35 ish and they are as far from 'middle aged' as you could get - besides given the average age of life expectancy is over 70, middle aged wouldn't be at 35 anyway. I agree with the poster who said if 60 is old then what do you call the period after that? In some cases people live to 90plus, that would mean they had spent 1/3 of their lives in your 'old' category. Granted, 60 isn't 30 and people are older but I know quite a few 60 year olds who would be heavily offended at being called old including my dad who has the body and fitness levels of someone half his age on account of running and cycling many miles every week. He can out run and out cycle many a younger person - and has done on many occasion.