At 70 you have earned the right to play a solo as you see fit. Jazz is always a personal thing and if you feel that you can play a better line than what is written then have at it! Stressing about high notes will only ruin whatever comes out if you try to be someone else other than you. Do the right thing and play what the audience will enjoy. They don't have the score in front of them, and most of them wouldn't be able to read it if they did. Best wishes.