Craigslist personals section in your area has long since been the go to for 100% free sex dating however it can be very hit and miss.
You are better to try one of the many free social networking dating sites that allow you to set up your own profile and search for members in your local area or even from another country.
Time is money of course and it might take you awhile before you find the person that is interested.
If you are an older guy tinder is not going to be great at matching you with similar aged singles as the APP has a lower age demographic.
UK Sex Meet provides access to thousands of willing, horny and consenting adult sex dating profiles from your area and the UK.