How old is a 2-year-old Sealyham Terrier in human years?

On the AAHA chart, a 2-year-old Sealyham Terrier is 24 human years in the up to 20 lb weight class.

How old is a 10-year-old Sealyham Terrier in human years?

On the AAHA chart, a 10-year-old Sealyham Terrier is 56 human years in the up to 20 lb weight class.

Which AAHA weight class is used for a Sealyham Terrier?

The verified weight 19.8 lb (male), 17.6 lb (female) is charted as up to 20 lb.

What size class does the age calculator use for a Sealyham Terrier?

The calculator is prefilled as small from the verified adult weight 19.8 lb (male), 17.6 lb (female).

Age calculator

Sealyham Terrier age in human years

Sealyham Terrier adults are charted from the verified weight 19.8 lb (male), 17.6 lb (female).

Last reviewed November 1, 2026.

Sealyham Terrier dog — Photo: Pleple2000 · CC BY-SA 3.0 · Wikimedia Commons

Your inputs

Results update live as you type.

Weight unit

Dog weight (lb)

Typical adult weight: 19.8 lb (male), 17.6 lb (female).

Dog age (years)

Size category

Prefilled as small from this breed's adult weight.

Your results

Live — updates as you change inputs.

Dog age conversion

53 years

Human-equivalent age

Size category

small

Life stage

Adult

Uses the logarithmic formula from canine DNA methylation research (16 × ln(age) + 31 for age ≥ 1).

Senior thresholds vary by size — large breeds age faster.

Lifespan12–14 years

Weight19.8 lb (male), 17.6 lb (female)

SizeSmall GroupTerrier Group

On the AAHA canine age chart that weight falls in up to 20 lb. The calculator on this page is the PawCalculator dog age calculator: 16 × ln(age) + 31, with the senior threshold set from the small size class. The table is the AAHA chart, which changes with weight class, so the two numbers answer different questions.

Reading the numbers

At 10 years the chart reads 56 human years. That is the smallest AAHA weight class. Heavier classes read older in human years at the same birthday.

The listed lifespan is 12–14 years, so a 10-year-old is still inside the published range.

AAHA age chart

Human years below are copied from the verified breed_human_age rows for this breed, not from the calculator formula.

Sealyham Terrier age in human years by the AAHA weight class

Swipe sideways to read every column.

Dog age	Weight class	Human years
1	up to 20 lb	15
2	up to 20 lb	24
3	up to 20 lb	28
4Current age	up to 20 lb	32
5	up to 20 lb	36
6	up to 20 lb	40
7	up to 20 lb	44
8	up to 20 lb	48
9	up to 20 lb	52
10	up to 20 lb	56
11	up to 20 lb	60
12	up to 20 lb	64
13	up to 20 lb	68
14	up to 20 lb	72