That is a very difficult question to answer. What do you mean by "Older"? For example, my wife's grandfather remarried after having been a widower for many years, at the age of 92 and relocated from Canada to Australia!
It is certainly possible for the elderly to marry. Whether or not it is a wise decision to do so depends on individual circumstance.
Here are links to information which will be of use to you:
I hope you have found this helpful.