As WorsbroughRed said, Flicker says he wants to attract more families to the club so wants children of all ages to be able to go.
He's managing the club as well, y'know. Lot's of changes. I'm 100% sure he said he's getting rid of the no under 5s rule.
Under 10's should be free anyway, in my opinion. Give them free football, get them hooked, and they'll spend their money in later life.
Was thinking about this other day... I was born in March 1992, and had my first season ticket for the Premiership year in 97/98 so would've been 5 for the majority of the season. My parents took me to quite a few games in the promotion season and maybe even before that and I'd have been 4 or under for the most of that. Can't believe the club would've stopped me going, ended up proper hooked now who spent as much time as anyone travelling last season, a fan they might not have had if I'd not gone at that age.