Well mate depending on it's age there is no reason why they can't go for 10 or 15 years, The longest record goes to the Engels Only because they have been making them longer than most other companies, There are people here with the newer ARB's that have had them since 2009 and there are some folks who have had the Waeco/dometic's just as long, There is good and bad in every brand, Engel are great fridges but ARB and Waeco etc make better use of space and have more modern useful features and due to the design you can get longer items in them,
If that 35 is under warranty you should be good to go but saying that I see no reason why it shouldn't keep going Ay.
good luck with what ever you decide,