Many will already be aware of this site, but for those who are not, and are in need of aged photographs, this may be the site for you.
The 'Oldifier' allows you to browse your drive for a suitable photograph, and by clicking the blue button, age it by 70 years in an instant. Photos can then be 'saved as' to where you want to store it.
No need to download complicated photo editing software, this Japanese site has made time-travelling memories easier. And you don't even need to be able to read Japanese!