--max-age option is also filtering remotely and should only be locally

rclone is doing the age filtering on the source and the destination and should only do the age filtering locally.

See also topic
https://forum.rclone.org/t/reduce-number-of-s3-head-requests/10626/8

Can you make that as an issue on github please?

I've added it on github
https://github.com/ncw/rclone/issues/3315