I'm close to 32 and have two kids now, so the financial pressure is there, while having accepted relatively low pay in high cost-of-living locations for roughly a decade left me without a semi-large cushion to reorient my career or even take a sabbatical to spend with my kids. This also limits my options, just leaving for another country for a potentially higher paying job with lower job security is a risk that might be too large...
Use your twenties wisely, i'd recommend first amassing a cushion at a FANG or freelancing if possible, before trying to "learn the art" at a startup. There surely is a great many things I can teach now, having picked and fought and won my own battles for quite some time now, but there is a high chance it leaves you and your loved ones in an unenviable position compared to just grinding away in your FANG Job.