Pet Age 1 to 500: How Growth Changes Value
Age is the quiet multiplier in Grow a Garden. Weight and mutation grab attention, but a pet that sits at age 500 is worth roughly three times its age-1 base — with no change to weight or rarity. This article explains the growth curve, what XP the climb requires, and when waiting for growth beats trading up early.
The age multiplier curve
Our calculator uses a linear age curve capped at 500:
age multiplier = 1 + (age − 1) × 0.004
- Age 1 → ×1.000 (newborn baseline)
- Age 125 → ×1.496 (about +50%)
- Age 250 → ×1.996 (about ×2)
- Age 500 → ×2.996 (about ×3)
The curve is gentle and steady — every level adds the same +0.4% of base. There is no spike level to rush for; value accrues continuously.
| From age | To age | Value gain |
|---|---|---|
| 1 | 100 | +39.6% |
| 1 | 250 | +99.6% |
| 100 | 300 | +43.3% |
| 250 | 500 | +50.1% |
| 1 | 500 | +199.6% |
XP needed to level
Leveling requires XP that grows with level. A community-style quadratic estimate used in our planner:
XP for next level ≈ 25 × level1.6
Early levels are cheap — you can push a pet through its first hundred ages quickly. The back half of the climb (300 → 500) costs disproportionately more, which is why fully aged pets carry a trading premium: the seller invested real time.
Estimated total XP by milestone
| Target age | Cumulative XP from age 1 (approx.) |
|---|---|
| 50 | ~245,000 |
| 100 | ~1,504,000 |
| 250 | ~16,419,000 |
| 500 | ~99,806,000 |
Estimates for planning only. Actual XP rates vary with activity, events, and game updates.
Passive days to reach a target
With roughly 5 age per day from passive care (food, presence, basic play), a rough timeline looks like:
- Age 1 → 50: about 10 days
- Age 1 → 100: about 20 days
- Age 1 → 250: about 50 days
- Age 1 → 500: about 100 days
Events, food quality, and active play can compress this. Use the Age 1–500 Planner to model your exact range.
When aging beats trading up
Keeping and aging a pet makes sense when:
- You already like using the pet in your garden routine.
- The mutation is strong — aging compounds on top of a high multiplier.
- Supply is low, so a fully aged version will be scarce later.
- Trading fees or hassle (multiple small adds) would eat the upgrade margin.
When to trade up instead
- You are stuck on a pet with poor abilities for your playstyle.
- The age premium is smaller than the rarity jump you can get now.
- An event is ending and liquidity matters more than long-term growth.
- Your pet sits in the slow back half of the curve (300+) with better uses elsewhere.
Worked decision example
Compare two options for a Legendary, 5 kg, no mutation:
- Keep current pet, age 80 → 200: gain ≈ +18% value over time, no trade cost.
- Trade into an Epic now: base jump from 55/kg to 20/kg… wait, Epic is lower — instead imagine a Mythical jump (55 → 140/kg): +154% immediately.
Rarity jumps dominate age gains when they are large. Age growth wins when the alternative upgrade is small or expensive. Run both scenarios in the calculator before deciding.
Common age mistakes
- Pricing every pet as age 500: inflates offers and kills deals.
- Ignoring age on your side: underpricing your aged pets as if they were newborns.
- Assuming age changes weight: it does not — only the multiplier moves.
- Expecting a cliff at 500: growth stops at 500; there is no level 501 bonus.
Frequently asked questions
What is the maximum pet age?
500. Our planner and pet value calculator both enforce this cap.
How much is a max-level pet worth?
Approximately 3× its age-1 value, before weight and mutations.
Does age affect trades noticeably?
Yes — a 200% gap between newborn and maxed is larger than most negotiation margins.