I met my husband on a singles chat line. We dated for a year and a half and we have been married for 4 years now. Use all the precautions you would normally use when getting to know someone (meet in a public place the first few times you see each other, etc.). It also doesn’t hurt to conduct a criminal background search on someone that you are thinking about dating seriously, and they are relatively inexpensive. I am 52 and my husband is 49.

I believe I heard a few success stories from people over 40 that used PlentyOfFish.com. Did I mention its FREE?
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Actually online dating can be extremely effective for those over 40. Many in that age range are busy with careers and children and free time is limited.