Is 35 really the best age to be?

What's the best age to be? Carefree 16 or a young-enough-to-have-fun but old-enough-to-leave-home 21? Or maybe a wise and stately 65? No – it's 35, according to research by insurer Aviva.
http://www.guardian.co.uk/money/blog/2012/apr/18/is-35-best-age

However,in 2010, research by relationship counselling group Relate suggested 35 was the beginning of the misery years for some, with work and relationship pressures taking their toll on many.