📖 Overview
Use this tool to model age-stage planning with a senior-life adjustment factor.
⚙️ How It Works
This applies a base age factor and adjustment percentage to estimate life-stage equivalent age.
The Formula
Human Age = Pet Age × Base Factor × (1 + Adjustment% ÷ 100)
| Base Factor | Initial human-year multiplier (e.g. 5 for small dogs, 7 for large dogs) |
| Adjustment % | Percentage correction for breed, size, or senior life-stage |
💡A 2023 study (Horvath et al.) using DNA methylation found that dog aging is non-linear — a 1-year-old dog is biologically similar to a 30-year-old human. Simple multipliers are approximations.
Quick Reference
| Life Stage | Typical Adjustment | Reason |
|---|---|---|
| Puppy / kitten (0–1yr) | +20 to +30% | First year equals 10–15 human years |
| Young adult (2–5yr) | 0% (baseline) | Relatively steady aging pace |
| Middle age (6–9yr) | +10 to +15% | Aging slightly accelerates |
| Senior (10+ yr) | +20 to +30% | Accelerated aging in later years |
Practical Tips
💡 Use conservative adjustment values for planning.
💡 Re-evaluate assumptions for senior pets.
Frequently Asked Questions
❓ Is this medically exact?
No, it is a simplified planning estimate.
❓ Why add senior adjustment?
Aging pace can differ across life stages and breeds.