Foundation cracks are way more common than one would expect. In general, you can expect them every 10 years or so, unless your foundation gets a thorough examination and proper treatment annually.
The problem is that hydrostatic pressure is constant — it just never stops. The pressure that your walls have to withstand may change with seasons or the weather, but it’s also always there. And while the liquid in the soil refreshes fairly often, with every snowfall or rainfall, your foundation walls stay the same. With age, they tend to lose integrity, bend, bow, and obviously — crack. It’s a common issue if you have no foundation repair done or your foundation is reinforced on time.