That shouldn't affect them as long as they aren't starved. Even that takes some time - days in fact. The peeps will probably die of old age slightly earlier in the first few generations; around 50-55 perhaps, instead of 60-65. That's because they are probably not fed so well as later, when it's possible to buy better food (for more coins of course). They might also die of illness if not treated. Again, sometimes it might be that they can't afford medicines early on, but usually not to the extent that a whole series of families dies.

The bank account screen shows how much the peeps should earn each day, broken down into their wages and interest. You don't say anything about how many coins you bought or how many generations have gone by, but 180,000 coins is quite a sizeable amount.