My parents insisted my brothers and I air out our equipment as kids and that habit has stayed with me in adulthood. My current skates, OG jetspeeds, are a few months shy of 7 years old now.
Good to know build quality hasn't been an issue for you in 4.5 and good to know that someone else wears smaller skates, lol. I wear a 10.5 or 11 Nike and my wife teases me about my small skates.