I have no idea what my first one was, but it would have been in August 1970. My first walk with a rucsac on my back was Ingleton waterfalls a year earlier.
I started bagging about 1990ish, and the final walk on 25/8/96 went:
Sour Howes >Sallows >Yoke >Ill Bell >Froswick >Thornthwaite Crag >Gray Crag.
The next one I did on the following day was Haystacks, where my dads ashes are scattered. The last Lakeland fell I stood on was Outerside on 29/8/03.