Catherine:
I checked the 1901 census and found a Michael Colahan in Ballymanagh. He was not there in 1911 and presumably died. I did find an 1906 civil death index record for a Michael Coolehan in the Ballinasloe registration district. The age fits your information
http://www.census.nationalarchives.ie/pages/1901/Galway/Lissmanny/Bally…
| First name(s) |
Michael |
|---|
| Last name |
Coolehan |
|---|
| Birth year |
1833 |
|---|
| Age at death |
73 |
|---|
| Registered year |
1906 |
|---|
| Registered quarter/year |
Jan - Mar 1906 |
|---|
| Registration district |
Ballinasloe |
|---|
| Volume |
4 |
|---|
| Page |
13 |
|---|
There was a Bridget Colohan civil death index record for a Bridget Colohan in 1878 (below). There was also one in 1882.
| First name(s) |
Bridget |
|---|
| Last name |
Colohan |
|---|
| Birth year |
1835 |
|---|
| Age at death |
43 |
|---|
| Registered year |
1878 |
|---|
| Registered quarter/year |
Jan - Mar 1878 |
|---|
| Registration district |
Ballinasloe |
|---|
| Volume |
4 |
|---|
| Page |
27 |
|---|
I also located an 1866 civil death index record for a Peter Coolahan, Possibly this was the father of Michael.
| First name(s) |
Peter |
|---|
| Last name |
Coolahan |
|---|
| Birth year |
1796 |
|---|
| Age at death |
70 |
|---|
| Registered year |
1866 |
|---|
| Registered quarter/year |
1866 |
|---|
| Registration district |
Ballinasloe |
|---|
| Volume |
4 |
|---|
| Page |
32 |
|---|
Let me know if you have questions
Roger McDonnell