I thought that was the case but my realtor told me I couldn’t do that because he has a right to peace at his home.

Your lease should include a "right to quiet enjoyment" clause that basically says everyone has a right to enjoy the property in peace.

But my guess is that she is not going to go peacefully and seems like she would sue and say that I am discriminating against the elderly (which is NOT the reason I need her to move out).

However, I'm starting to really hate sharing my place due to need for increased privacy and peace as I get older.

If you have everything ready to go and can deal with the vacancy, then do it and have peace of mind knowing you won't have repairs and can get top dollar for the unit. 

That $50 will make her feel great, and it sure buys me a lot of time and peace of mind (in knowing that the tenants aren't breathing down my neck waiting for me to get there).Personally I think it's a great business move and a great morale move as well. 

Peace. 

Though captial growth can seem stymied by using your money to pay off debt, the month to month feeling of getting your whole check to yourself is a peace dividend.

It gives them time to move with a peace of mind instead being on a time crunch.

Their fee is worth every penny in peace of mind, regardless of whether they find that the house is about to fall down or that there's nothing to worry about.