Died aged 68, which would place birth around 1810, but is 46 in 1851, which fits with birth around 1805.
58 in 1861, which would put birth around 1803.

Died at 33 Thread St, Paisley

Death reported by son William

Born in Paisley, Scotland; according to 1841, 1851 census between 7-jun-1834 and 30-Mar-1835
22 at wedding, i.e. implying born between 14-Aug-1834 and 30-Mar-1835
Probably born after parents' wedding on 14-Dec-1834

age 20 in 1861 census is clearly wrong

TOWERS other surname DONALD    
JANET    
58        
1894    
644/10 75    
Anderston

Born, according to 1841, 51 census between 7-jun-1836 and 30-Mar-1837
26 at wedding, suggesting born between 25-Nov-1838 and 24-Nov-1839
57 in 1891 census, suggesting born between 1833 and 1834
23 in 1861, suggesting born around 1838.

Died in 1911, in Paisley, aged 73, again suggesting born around 1838.

1911    TOWERS    EUPHEMIA         KERR    F    73    PAISLEY    /RENFREW    573/01 0829        

Born in Paisley, Scotland; according to 1841, 51 census between 7-jun-1838 and 30-Mar-1839

1922  TOWERS     AGNES F     83  PAISLEY     RENFREW     573/01 0099

Reported death of his father and mother
Born between 6 Apr-1842 and 3-Apr-1843 according to 1881 & 91 censuses, however age 84 at death suggests between 14-Mar-1841 and 13-mar-1842
1861 census aged 19 suggests between  8-Apr-1841 and 8-Apr-1842.

Died at 51 Seedhill Rd, Paisley.
Death reported by son Alex.

Born in Paisley, Scotland; according to 1851 census between 31-Mar-1843 and 30-Mar-1844
23 at wedding, suggesting born between 10-Oct-1844 and 9-oct-1845 

death in Paisley, 1912, aged 69 (Annie Towers)
1912 TOWERS ANNIE     STEVEN    F 69 PAISLEY/RENFREW 573/01 1343

Born in Paisley, Scotland; according to 1851 census between 31-Mar-1846 and 30-Mar-1847

33 at wedding, so born between 17th July 1846 and 30-Mar-1847
Died aged 82, so born between 17th July 1846 and 28-Jan-1847.

Died at 7 Walker St.. Paisley; death reported by son William