On the 1851 census, “age” means “age at next birthday”.

New Brunswick

Kings County

Studholm, Kings County
House

Nathaniel Johnson, male, head, age 56, Farmer Prop., birth [i.e., in the colony from birth].
Ann Johnson, female, wife, age 47, birth.
[+ 6 children]
Edward Tinling, male, lodger, age 82, English (race), Gentleman, date of entrance to colony – 1822.

Page 30, House

Thomas Tinling, male, head, age 55, English (race), Farmer Prop., date of entrance to colony – 1820.
Rachel Tinling, female, wife, age 39, birth [i.e., in the colony from birth].
Edward Tinling, male, son, age 13, birth.
Mary Tinling, female, daughter, age 11, birth.
John Tinling, male, son, age 10, birth.
William Tinling, male, son, age 7, birth.
Amanda Tinling, female, daughter, age 6, birth.
Thomas Tinling, male, son, age 3, birth.
Isaac Tinling, male, son, age 1, birth.

Ontario

Brant County

Dumfries South, Brant County
E.D. 3, Page 165, Line 49

John Tinling, farmer, Baptist, born in Canada, age 18, male.

Lincoln County

Grantham, Lincoln County
The John and Sarah (Hainer) Tinline family were probably listed on this return, which no longer exists.

Louth Township, Lincoln County, Ontario
Personal Census, Page 1, Line 32

James Tinline, carpenter, born Scotland, religion – Kirk, next age 61, male, married, 2 males and 1 female in household attending school, a one-story house made of brick occupied by one family.
Margaret Tinline, born in Canada, Methodist, next age 55, female, married.
James Tinline, farmer, born in Canada, Methodist, next age 30, male, single.
Caroline Tinline, born in Canada, Methodist, next age 23, female, single, “not a member” [of what?]
William Tinline, carpenter, born in Canada, Methodist, next age 26, male, single.
Ann Tinline, born in Canada, Methodist, next age 21, female.
John Tinline, carpenter, born in Canada, Methodist, next age 19, male.
George Tinline, carpenter, born in Canada, Methodist, next age 13, male.

[Only Tinlin(e) family found in Louth Township].

St. Catharine’s, Lincoln Co.
Personal census no longer extant.

Waterloo County

Galt, Waterloo County
Division 1, Page 13A, Line 30

John Tinling, farmer, born in Scotland, Presbyterian, age 56, male, married, stone dwelling of 1 1/2 stories.
Margaret Tinling, born in USA, Presbyterian, age 55, female, married.
Agness Tinling, born in Upper Canada, Presbyterian, age 13, female.
John Moss, born in Upper Canada, Presbyterian, age 3, male, member of family. [Maus]
Catherine Tinling, born in Upper Canada, Presbyterian, age 16, female.

Division 1, Page 18A, Line 32

Thomas Tinling, wagon maker, born in Scotland, Presbyterian, age 19, male.

Welland County

Pelham, Welland County
E.D. 380, Township 4, Page 39, Line 9

Sarah J. Tinline, born in Canada, no creed, age 17, female.
[Living near Schram family].

Thorold, Welland County
E.D. 381, Township 2, Page 59, Line 18

William Tinline, carpenter, born in Canada, Church of England, age 23, male.

Wentworth County

Binbrook, Wentworth County
Agricultural Census, Line 14

Brook Tinlin, “concession or range” = 4, Lot No. 1, 92 acres.

[Same as above:]
Agricultural Census, Line 36

Francis Tinlin, “concession or range” = 5, “lot or part of lot” = 28, 168 acres.

[Both are followed by a long list of which acres were planted in which crop and how much was produced.  The personal census for Binbrook no longer survives.]

York County

King Township, York County
Personal Census, Part 1, Page 5, Line 32

James Tinline, merchant, born Scotland, Presbyterian, age 25 at next birthday, male, single, 2 male residents of household, frame house of two stories occupied by 1 family with a store (business).
Alex Willson, age 25 at next birthday, born Scotland [did not write down all of his entry].

[No entries in Agricultural Census].