National Rail offer a wide range of discounts that cover a variety of age groups. As there are so many different discounts depending on circumstances, time and location we have included the 2 links below so that you can check their directly.
This is the main discount page that has links to the various discount options such as railcards, child, group, local and over 60s discounts and other concessionary schemes: http://www.nationalrail.co.uk/times_fares/17.aspx
This is their A-Z special offers page where you can browse or search for specific places or discount names: http://www.nationalrail.co.uk/times_fares/alpha_index.aspx