Don't make limits for yourself. Friends who are both much younger and much older broaden our outlook on the world. It's mind expanding having old views thrown out of the window after listening to new opinions.
It's good to shake off old habits, and finding a new friend who you might not have considered before is very rewarding.
If you try something new every day, not only will you stave off Alzheimer's, you will keep life exciting. Try Z Point to remove old memories which keep you stuck in familiar patterns, and free yourself to be open for new experiences.
Enjoy the short, but very sweet, video example of loving friendship to make you smile.
"In everyone's life, at some time, our inner fire goes out. It is then burst into flame by an encounter with another human being. We should all be thankful for those people who rekindle the inner spirit." - Albert Schweitzer