Firstly, it doesn't really matter to keep geared up to your own level, but rather the content you are currently participating in. If you're at level 50 wearing level 30 armour while doing level 30 quests, you're fine.

Additionally, if you're keeping up with your job quests then you'll receive some good gear from the level 45 quest (head, arm, leg and foot gear only) and you can buy a level 44 weapon and body piece probably cheap on the marketboard, because the level 44 dungeon gear can be traded so they are often overstocked and selling cheap.

You'll get an upgraded i90 version of the job gear at level 50, this time including a body piece, and then the post-credits quests will start giving you free jewellery and weapons.