Huge ask. I ran a 4:17 1500 (mid 4:30s mile conversion?) at 42 and am now 51. Although I doubt I'll try, if I were able to get under 5:00 now, it would be a tremendous effort and I'm not sure my body would cooperate.
No tips or additional energy expended here until/unless you post your PRs - both young and old. Happy to tell you how I trained for my masters come back if you're serious.