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Most people have no idea I'm 41, and instead think I'm in my 30s. Balding and grey hair show I'm not in my 20s ;) My 'secret' is I workout every single day . I might do heavy weight training, sled pushing, surfing, or a spin class. It doesn't matter as long as I do something physically challenging. I also follow an 80/20 rule on eating paleo-ish. Mainly I try to avoid processed foods, but I'll still eat a pizza or go…
Do you have children? I used to run or cycle at least 5 days a week but since my daughter was born (and stopped being an infant) it is a struggle to keep a regular exercise regimen. I try to run with her in a jogging stroller when I can but this is much more susceptible to foul weather than when I could just adjust my own clothing.
And yes, life can cause exercise to suffer. Kids, work, etc... will throw curve balls. Do what you can, and keep the fire going. Maintain until you get back to going hard.