Great Danes grow up and grow old quickly, like most giant breeds. A Great Dane of 7 is already a senior dog.
A 5-year-old Great Dane is about 42 in human years, and a 10-year-old is about 78.
| Dog age | Human years |
|---|---|
| 1 year | 15 |
| 2 years | 24 |
| 3 years | 32 |
| 4 years | 37 |
| 5 years | 42 |
| 6 years | 49 |
| 7 years | 56 |
| 8 years | 64 |
| 9 years | 71 |
| 10 years | 78 |
| 11 years | 86 |
| 12 years | 93 |
| 13 years | 101 |
| 14 years | 108 |
| 15 years | 115 |
| 16 years | 123 |
Great Danes count as giant dogs (over 41kg when fully grown). Giant breeds age fastest of all. After two, each year adds about 7 human years. If yours is much lighter or heavier than usual, pick their actual size in the full converter.
Open the full converterIn a 2024 study led by Dogs Trust, published in Scientific Reports, which looked at more than half a million UK dogs, half of Great Danes lived to 10.6 or older. That's shorter than dogs overall, and about the same as a person reaching 83.
Lifespan figures: McMillan et al. (2024), Longevity of companion dog breeds: those at risk from early death, Scientific Reports. Age chart attributed to the American Animal Hospital Association.