That is a reasonable range for your HR and if you keep it up, it will go down as you get more aerobically fit and you and your heart become more efficient. I am 40+ and routinely maintain an average HR higher than that on long runs and bike races. I usually start to suffer at 185bpm but can go for long times at 175bpm and hard sprints, running or biking, get me to 200+bpm which is pretty much my maximum. All this varies greatly from person to person but once you get to know your heart, it can be a very effective tool to gauge how you are feeling and what you have left in the tank. Sounds like you are gaining that understanding and backing off a little to recover.