Songkick is an aggregator of tour dates and ticket links from hundreds of sources. This means that Songkick doesn't directly ticket the events it lists, but rather provides links to buy tickets.
If you click through to a ticket link on Songkick, you're directed to the ticket vendor's website. Here, you will be able to find all other information about the event, such as age restriction, ticket pricing, and pre-sale ticket availability.
You can find links to the most popular ticket vendor help pages here: