In reverse order these are my previous challenges:
5th decade (2000): Ran London Marathon. My 3 brothers and my sister ran it also. My maiden name was Jones and we all had a letter on our backs (in order of age), So I was the 'O'.
4th decade (1990): Ran in the Snowdon Race (5 miles up and, obviously, 5 miles down). And I wasn't last!!
3rd decade (1980): Learnt to ride a motorbike and pass my test.
2nd decade (1970): Strictly speaking, I hadn't actually started on my challenges then but, just by chance, I married Peter this year (and what a challenge that has been!! :-))
1st decade (1960): Come on - I was only 10!!!! I was just enjoying riding my bike and playing cowboys and indians, etc with the other kids.