Memories - After some point of time in life you realized what have you missed while cherishing those moments. Some people stay forever and some stay for a limited period of time, but at the end what's remembered is their character, personality and time spent with them. Don't lose those gems and don't let them forget you.
Be a kind person and make people understand about the relations you share with them. Because at the age of 75, what you gonna remember is those memories and those gems in it.