I get excited just thinking about collectible hunts, so here's the long take: there isn't a single, universal product line officially called 'Ultimate of All Ages' that I'm aware of. What you do find, though, are lots of officially licensed collectibles that are designed to be family-friendly or broadly appealing across age groups. Big franchises like 'Pokémon', 'Super Mario', and 'Studio Ghibli' routinely put out plushies, figurines, playsets, and art books that are safe and intended for fans of nearly any age.
If you want something branded explicitly for all ages, look for age ratings on the packaging (like 0+, 3+, or general family-friendly labels) and shop at official brand stores — the 'Nintendo' online store, the 'Pokémon Center', or 'Studio Ghibli' shops are good bets. Limited or 'ultimate' collector's editions that come with extras (artbooks, statues, soundtracks) are often aimed at adult collectors but are still family-friendly in subject. I usually cross-check with product images, manufacturer SKUs, and retailer credibility before pulling the trigger; that keeps me from accidentally buying bootlegs or an item with small choking hazards. Honestly, scoring a nicely packaged, officially licensed piece feels great, like a tiny museum exhibit on my shelf.
If you want recommendations, I can point out specific lines that reliably straddle kid- and adult-friendly appeal — I've found 'LEGO' tie-ins, high-quality plush from official character stores, and brand-made
Hardcover art books are the safest bets for universal appeal. Happy collecting—there’s such a warm, comforting vibe to seeing those shelves filled with stuff that actually came from the source.