Should I buy a 'new' tyre that was manufactured in 2021?

I saw a brand new tyre which was manufactured in 2021 for a good price and wanted to get it fitted but obviously it's 4.5 years old. Is that a problem and reason to avoid or not?

Are letters DOT required on new tyres?

Hi I have had Michelin crossclimate tyres fitted which have a code 0723 with a few other codes preceding it. However there are no letters DOT anywhere on either tyre. A search tells me the letters DOT...