yea 6 years is good service for any battery and I wouldn't let my boat battery get that old regardless of how reliable it may seem.
To be fair though when I am using my boat you often can't see land for most of the trip so a bit harder to call up a tow.
and a house battery is a good option to consider if you have room,charging capacity etc.
Can have more light,sounds ,whatever without having the concern of running starting battery flat.
FYI, just bought a couple of new batteries for my cruiser from battery cell ,couriered to my door for about 2/3 price from battery shops
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