Assuming this is an upright (vertical) piano, the serial 261236 would belong to a unit built sometime in 1936. If the serial number belongs to a grand instead, it would have been built in 1984.
how old is my baldwin keyboard serial number 91002/28
How old is this piano with serial number 1510355
1978
As of November 2013, the age of a Baldwin piano with serial number 246905 would be 32 years old.
Very old about 209 years old
1980
1986
207 years
According to my copy of the Pierce Piano Atlas, the Baldwin piano with serial number 127398 was manufactured in 1954.
According to bluebookofpianos.com, an Acrosonic piano with this serial number would have been manufactured in 1964.
The Baldwin Acrosonic pianos were produced primarily from the 1940s to the 1960s. The serial number 570366 indicates that this piano was likely manufactured around the late 1950s to early 1960s, making it approximately 60 to 70 years old as of 2023. For a more precise age, consulting Baldwin's serial number charts would be beneficial.
According to http://www.bluebookofpianos.com/serial1.htm it would be between 1946 and 1956.