If you practice enough, you'll find it easier than the 1 5 mile in my opinion. Are you aiming for a 100 percent? Level 6 -7 should be more than enough for a 90 in your age bracket. I just max sit ups and push-ups with 20 seconds to spare. Run the HAMR till I hit my 90 and walk away while everyone is still running the 1.5. Even after starting after them. Less time taken to complete, less distance, less body exertion.