Electrum seeds with more than 13 words - are they OK?

[m1bxd]

Hi,

I trying to generate a nice random SEED phrase with a dice and several steps to get to:

electrum make_seed --entropy=13837166324271007511266747237152016797971056575940541277777369348077195841417

It will generate a SEED PHRASE

slice kit glow spike sell honey lens gym primary festival length chapter observe slow lecture breeze stereo pride velvet list climb enjoy vessel fee act

Question:

If the SEED phrase is more than 13 words is this OK or will it cause compatibility problems in the future?

Cheers Mark
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My tutorial as for:

http://mx.thirdvisit.co.uk/2015/08/02/how-to-bitcoin-cold-wallet-storage-using-random-dice-entropy-to-generate-a-deterministic-seed-phrase/