Fast boys

I want to pick up my running efforts after the Everest… that has given me stonking good endurance and despite not much targeting running this year it also kept my speed up.
So last night I braved it and stepped up to the fast group who go at 4:30 min km pace / in old money 7:15 mile.
45 mins and despite some of it being 4:15 I kept up and actually felt ok.
I was probably + twice the age of most in the group ! I did keep my top on though