I see that Atkinson is turning 48 in March, which used to be the retirement age for top level refs. According to this Graham Poll article from a few years back, European law now allows them to carry on well into their 50s as long as they pass the fitness requirements and get good marks from their assessors.
https://www.dailymail.co.uk/sport/f...emier-League-action-returns--Graham-Poll.html
https://www.dailymail.co.uk/sport/f...emier-League-action-returns--Graham-Poll.html