Life of a British Army soldier 1780-1808

Hi all, new to this forum and hopeful that someone who knows a bit about the lives of British Army soldiers during the period 1780-1808, and especially 1798-1808, might be able to help me.

I have a particularly interesting (to me!) ancestor by the name of Isaac Moore who was a participant in the 1817 "Pentrich Rising" in Derbyshire and Nottinghamshire. He was from Pentrich, Derbyshire, and married Hannah Martin in 1798 in Greasley, Nottinghamshire. They had a large family together and two of his sons emigrated to Australia, one of them my ancestor.

I am trying to work out whether my Isaac Moore was one and the same man as an Isaac Moore from "Pancarage", Derbyshire, who was discharged as a private from the British Army in 1808 after 28 years duty "worn out through length of service" aged 50 (I think my Isaac was 48). My question is, how likely is it that a 38-40 year old soldier who married in 1798 would then have children with his wife, as my Isaac did, in 1799, 1802, 1803, 1805 and 1807 prior to being discharged in 1808? These children were all baptised in Pentrich.

I have located the discharge papers of Isaac Moore the soldier on findmypast. They record that he was a member of Captain Percy's unit of the 2nd Battalion of Royal Fusiliers.

Many thanks in advance for any help that anyone might be able to offer.